Flame retardancy and toughness modification of flame retardant polycarbonate/acrylonitrile-butadiene-styrene/AHP composites

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• 作者：Ningjing Wu ; ^{ningjing_20132013@163.com" class="auth_mail" title="E-mail the corresponding author} ; ^{ningjing_wu@qust.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Shuguo Lang
• 关键词：PC/ABS alloy ; Flame retardancy ; Aluminum hypophosphite ; Toughness modification
• 刊名：Polymer Degradation and Stability
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：123
• 期：Complete
• 页码：26-35
• 全文大小：3477 K

文摘

A kind of flame retardant polycarbonate/acrylonitrile-butadiene-styrene copolymer (FR PC/ABS) composite was prepared by melt extrusion blending using aluminum hypophosphite (AHP) as a flame retardant and ethylene-co-acrylic ester-co-glycidyl methacrylate (EMA) as a compatibilizer. The thermal behavior and flame retardancy of FR PC/ABS composites were investigated by thermogravimetric analysis, the UL-94 vertical burning test, the limiting oxygen index, and the cone calorimeter test. The FR PC/ABS composites showed good flame retardancy, from no vertical rating for PC/ABS, to V-0 rating for FR PC/ABS containing 15 wt% AHP in the UL-94 test. PC/ABS/15wt%AHP/6wt%EMA composite was more efficient in decreasing the peak heat release rate (PHRR) of FR PC/ABS composite in the cone calorimeter test. The same amount of AHP provided equally strong flame inhibition and increased char flame retardancy in PC/ABS/AHP and PC/ABS/AHP/EMA composite. Whereas, the protective compact char layer of PC/ABS/AHP/EMA composite efficiently improved the flame retardancy that of PC/ABS/AHP composite. With the addition of 6 w% of EMA copolymers, the elongation yield at break of the FR PC/ABS composite increased by 6.7 times compared to that of the PC/ABS/AHP composite; and the notched impact strength and unnotched strength improved by approximately 250% and 710%, respectively, compared to those of the PC/ABS/AHP composite. Fourier transformed infrared (FT-IR) and scanning electron measurements (SEM) results indicated that EMA could effectively enhance the interfacial interaction of FR PC/ABS composite.